Mass per volume density.
Micrograms per Gallon to Grains per Quart Converter — ug/gal to gr/qt
Convert Microgram per Gallon (ug/gal) to Grain per Quart (gr/qt) using the exact conversion factor (1 microgram per gallon = 0.0000038581 grain per quart). See the formula, worked examples, and conversion table.
Micrograms per Gallon to Grains per Quart converter
Converter
Density Converter
Convert thousands of mass-per-volume density combinations for science, engineering, agriculture, and fluids.
Context values
Some unit families need one extra value for a physically accurate result.
Mass per volume density.
Result = input x 2.64172052e-7 / 0.06847224418.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Micrograms per Gallon to Grains per Quart
Microgram per Gallon and Grain per Quart both measure density — mass per unit volume — a property used to identify materials, check manufacturing quality, and predict whether something floats or sinks. As a fixed reference point, water has a density of exactly 1000 kg/m³ (1 g/cm³, 1 g/mL) at its temperature of maximum density, which is why many density figures in science and engineering are quoted relative to water. Both are mass per volume density units.
Formula
grains per quart = micrograms per gallon × 0.00000385808958824
This factor comes from each unit's defined relationship to the category's base unit: 1 microgram per gallon equals 2.641721e-7 base units, and 1 grain per quart equals 0.0684722441811 base units, so dividing one by the other gives the direct microgram per gallon-to-grain per quart factor of 0.00000385808958824.
Simple example
1 ug/gal × 0.000003858089588 = 0.0000038581 gr/qt
1 microgram per gallon = 0.0000038581 grains per quart.
Real-world example
1,000 ug/gal × 0.000003858089588 = 0.0038580896 gr/qt
1,000 micrograms per gallon = 0.0038580896 grains per quart.
Conversion table
| Microgram per Gallon (ug/gal) | Grain per Quart (gr/qt) |
|---|---|
| 0.1 ug/gal | 3.85809e-7 gr/qt |
| 1 ug/gal | 0.0000038581 gr/qt |
| 10 ug/gal | 0.0000385809 gr/qt |
| 100 ug/gal | 0.000385809 gr/qt |
| 1,000 ug/gal | 0.0038580896 gr/qt |
| 10,000 ug/gal | 0.0385808959 gr/qt |
Reverse conversion: Grain per Quart to Microgram per Gallon
0.0000038581 gr/qt × 259195.64 = 1.000002699 ug/gal
0.0000038581 grains per quart = 1.000002699 micrograms per gallon.
micrograms per gallon = grains per quart × 259195.64
For a page dedicated to this direction, see Grain per Quart to Microgram per Gallon.
Understanding the Microgram per Gallon (ug/gal)
Mass per volume density.
Understanding the Grain per Quart (gr/qt)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per quart are in 1 microgram per gallon?
1 microgram per gallon equals 0.0000038581 grains per quart, using the exact defined conversion factor rather than an estimate.
How do I convert microgram per gallon to grain per quart?
Multiply the microgram per gallon value by 0.000003858089588. The converter above does this instantly to whatever precision you set.
How do I convert grain per quart back to microgram per gallon?
Use the reverse factor: 1 grain per quart equals 259,195.64 micrograms per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgram per gallon?
Microgram per Gallon (ug/gal) is a unit of density.
What is a grain per quart?
Grain per Quart (gr/qt) is a unit of density.
Is the microgram per gallon to grain per quart conversion exact?
Yes. Both microgram per gallon and grain per quart are defined by fixed standards rather than physical artifacts, so the factor of 0.000003858089588 used above is exact to as many digits as you choose to display.
What's the difference between density and mass concentration?
Density is the mass of a pure substance or material per unit volume. Mass concentration is the mass of one component — like a dissolved solute — within a mixture's total volume. The two use the same kind of units but describe different physical situations.